Die for drawing shells or hollow articles



(No Model.)

R. WHITE.

DIE FOR DRAWING SHELLS 0R HOLLOW ARTICLES. No. 346,522.

; Patented Aug. 3, 1886..

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UNITED STATES ATENT OFFICE.

ROLLIN \VHITE, OF LOIVELL, MASSACHUSETTS.

DIE FOR DRAWING SHELLS OR HOLLOW ARTlCLE SPECIFICATION forming part ofLetters Patent No. 346,522, dated August 3, 1886.

Serial No. 187,477. (No model;

To all whom, it may concern.-

Be it known that I, RoLLIN XVHITE, a citizen of the United States,residing at Lowell, in the county ofMiddlesex and CommonwealthofMassachusetts, have invented a certain new and useful Improvement inDies for Drawing Metallic Blanks, of which the following is aspecification.

My invention relates to an improved form of die for drawing metalblanks; and it consists in the device hereinafter shown and described,whereby the blank is stripped from the punch.

In the accompanying drawings, Figure 1 represents a drawing-punch of theusual construction, a part of the head of a machine, the die, and a partof the die-holder, the die and holder being in section, and the lowerpart of the punch-socket and the lower nuts being broken away to showthe manner of holding the punch; Fig. 2, a sectional elevation of thedie and apart of the die-holder shown in Fig.1.

In the drawings, B represents the head of a machine, caused in practiceto have a reciprocating motion; ZZ, the nuts, and Z Z the checknuts, bywhich the punch-socket L is retained in the head; L, a drawing-punch ofthe usual construction; K, a part of the die-holder, the die N beingheld therein in the usual manner. The die N has one or more grooves orrecesses, 02., four being shown in the drawings, cut in the wall of thedie, preferably about horizontal, and extending about the internal wallof the opening of the die, in whatever part it is desired to leave theblank 7) when the punch is withdrawn from the die.

The operation of the machine is as follows: The blank I) is placed overthe die-opening, either by hand or fed by any well known feeding device,and the descent of the punch drives the blank into the die. As the punchis withdrawn, the blank 1) tends to follow it back and out of the die;but its upper end, spreading out, catches in one or more of the groovesor recesses, and the body of the blank, also tending to expand, swellsto a slight degrce into the grooves or recesses, thereby increasing thefriction between the walls of the die and the outside of the blank tosuch an extent that it is stripped from the punch.-

It is evident that the grooves or recesses may be made of various forms,as spiral, and made with an ordinary tap, or they may extend onlypartially ar und the circiunfcrence of the wall of the die-opening; butI prefer to make them substantially as herein shown and described.

I claim as my invention 1. A die provided with one or more grooves inthe walls of the die-opening, as and for the purpose specified.

2. A die having its inner wall recessed in one or more parts of thedie-opening, where by the blank, expanding into said recesses, may bestripped from the punch, substantially as shown and described.

ROLLIN \VI'IITE.

\Vitnesses:

llnnnnn'r It. \VHITE, ALBERT M. MOORE.

